【Solved】How to mount ventoy partition ?

[musicat]

Currently you can't mount /dev/sdb1 rw.  Because a device mapper is created based on the ISO files in sdb1, and this will make /dev/sdb1 readonly and busy.

How do you mount /dev/sdb1 as read-only???
When I tried it said "already mounted or busy" and I can't access it